{stdenv, fetchurl, bison, interactive ? false, ncurses ? null}:

assert interactive -> ncurses != null;

stdenv.mkDerivation {
  name = "bash-3.2";

  src = fetchurl {
    url = ftp://ftp.nluug.nl/pub/gnu/bash/bash-3.2.tar.gz;
    md5 = "00bfa16d58e034e3c2aa27f390390d30";
  };

  postInstall = "ln -s bash $out/bin/sh";

  patches = [
    # Fix a nasty bug in bash-3.2.
    ./bash32-001.patch
  
    # For dietlibc builds.
    ./winsize.patch
  ];

  # !!! only needed for bash-3.2 (because of bash32-001.patch)
  buildInputs = [bison] ++ (if interactive then [ncurses] else []);

  meta = {
    description =
      "GNU Bourne-Again Shell, the de facto standard shell on Linux" +
        (if interactive then " (for interactive use)" else "");
  };
}